Although the "Fight Club" director reportedly was looking for an unknown for the role of hard-boiled, bisexual Lisbeth Salander in his adaptation of the late Stieg Larsson's smash novel, a source close to the situation tells us not to rule out Scar-Jo.

Last Tuesday, our source says Johansson auditioned for Fincher in Los Angeles and the director and his team were "very impressed" with the bodacious babe. Johansson was told to come prepared with an accent for the Swedish character of Salander, which shouldn't have been a heavy lift. The 25-year-old actress has already sported foreign dialects in "Girl With A Pearl Earring" and "The Other Boleyn Sister."

It probably doesn't hurt that Johansson's father is a native of Denmark, where the native tongue is quite similar to neighboring Sweden's language. (An actual Swede, actress Noomi Rapace played Lisbeth in the original 2009 European film adaptation.)

Our source tells us that if Fincher doesn't go with an unknown, Scar-Jo is a "shoo-in" for the role of Lisbeth, especially since production is reportedly slated to begin just after Labor Day. The picture is scheduled for a December 2011 release.

Subsequently, Fincher was said to be looking to go the way of "Twilight," by casting a fresh face to star along-side his leading man, Daniel Craig.

Whoever wins Fincher's approval will most likely win more than just a single role. "Dragon Tattoo" is the first of Larsson's three-novel "Millennium" trilogy, which has sold more than 40 million copies. And Hollywood is betting there will be three films as well.

Johansson included, who, after turning heads in "Iron Man 2" could use a leading lady role with legs. According to our source, Johansson "loves" the "Dragon Tattoo" script and "really wants [this role] bad."